Cases of whooping cough have rocketed across the country, with confirmed cases in the South West among the highest in England - two and a half times the national average. Bristol had 155 cases confirmed in 2012, compared with just 18 in the last peak year of 2008.
Pregnant women and their unborn babies are particularly at risk. Health experts are urging expectant mothers across the region to get vaccinated.
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Hundreds are expected to attend the service wearing pink, Maisie Duncan's favourite colour.
A bright chilly start but a fine afternoon with sunny spells for most. Mild winds will help temperatures approaching double figures.
A chilly start with some cloud but that will break up allowing sunny spells to dominate the afternoon. Temperatures are on the rise too.